The Texas Speed 1-7/8" Long Tube Headers with 3" Catted X-Pipe is a complete header and mid-pipe package for the 2015 to 2023 Ford Mustang GT with the 5.0L V8 (S550 chassis). Both the headers and the X-pipe are built from 304 stainless steel, and the X-pipe carries a pair of high-flow catalytic converters so the car keeps converters ahead of the factory or aftermarket cat-back system.
The headers use 2.0 mm wall tubing formed on CNC mandrel benders and end in 3" merge-style collectors with a welded O2 bung and a velocity spike that Texas Speed credits with improved power and torque. The package ships with MLS exhaust gaskets, front O2 sensor extension harnesses and the band clamps needed to join the X-pipe to the stock exhaust. Texas Speed notes that 2017 and newer cars require cutting and welding where the rear of the X-pipe meets the axle-back because Ford changed the factory pipe diameter.
Specifications
- Fitment: 2015 to 2023 Ford Mustang GT 5.0L (S550)
- Primary tube diameter: 1-7/8"
- Material: 304 stainless steel headers and X-pipe
- Tubing wall thickness: 2.0 mm
- Collector: 3" merge style with welded O2 bung and velocity spike
- X-pipe: 3" 304 stainless steel with high-flow catalytic converters (not CARB certified)
- Gaskets: MLS exhaust gaskets included
- O2 extensions: Front extension harnesses included, 24" for 2015 to 2017 or 18" for 2018 and newer (selected at ordering)
- Clamps: Band clamps included for connecting the X-pipe to the factory exhaust
- Emissions: Off-road use only, not emissions compliant
Kit Includes
- Texas Speed 1-7/8" 304 stainless steel long tube headers, 2015+ 5.0L Mustang (TSP-50178H)
- TSP 3" 304 stainless steel catted X-pipe, 2015+ 5.0L Mustang (TSP-2015-5.0-CATX)
- TSP MLS exhaust gaskets for 2011+ Ford 5.0L, qty 2 (TSP-5392-030)
- Front O2 sensor extension harnesses (length selected at ordering)
- Band clamps
Ordering Options
Choose the Front O2 Extensions option that matches the model year of the car: 24" extensions for 2015 to 2017 Mustang GT or 18" extensions for 2018 and newer Mustang GT. Texas Speed also offers its Coyote long tube header stud kit as an optional add-on for this package.
Note: This exhaust system is for off-road use only and is not emissions compliant.
Note: 2017 and newer Mustangs require cutting and welding at the rear of the X-pipe where it joins the axle-back exhaust because of a change in factory exhaust pipe diameter.
Vehicle Applications
Ford Mustang
- 2015 Ford Mustang — GT 5.0L
- 2016 Ford Mustang — GT 5.0L
- 2017 Ford Mustang — GT 5.0L
- 2018 Ford Mustang — GT 5.0L
- 2019 Ford Mustang — GT 5.0L
- 2020 Ford Mustang — GT 5.0L
- 2021 Ford Mustang — GT 5.0L
- 2022 Ford Mustang — GT 5.0L
- 2023 Ford Mustang — GT 5.0L
Vehicle applications reflect the fitment published by Texas Speed & Performance for this part number. Confirm your engine and cylinder head configuration before ordering.
Race Use Only. This product is intended for competition use on vehicles that are never operated on public roads. It is not legal for sale or use on pollution-controlled motor vehicles, and it is not CARB exempt. Installing or using this part on a vehicle driven on public roads may violate the federal Clean Air Act and state emissions laws.
FAQ
What vehicles do the Texas Speed 1-7/8" long tube headers and catted X-pipe fit?
This package fits the 2015 to 2023 Ford Mustang GT with the 5.0L V8 on the S550 chassis. It is not listed for EcoBoost or V6 Mustangs.
Are catalytic converters included with this header package?
Yes. The 3" 304 stainless X-pipe in this package has high-flow catalytic converters built in. Texas Speed notes they are not CARB certified and the system is for off-road use only.
Does this kit bolt to the factory exhaust on a 2017 or newer Mustang GT?
Not without modification. Texas Speed states that 2017 and newer cars need cutting and welding at the rear of the X-pipe where it meets the axle-back because Ford changed the factory exhaust pipe diameter. 2015 and 2016 cars connect with the included band clamps.
Which O2 extension option should I choose?
Select the 24" front O2 extensions for a 2015 to 2017 Mustang GT and the 18" front O2 extensions for a 2018 and newer Mustang GT. The option is chosen when ordering and is included in the package price.
How is this different from the Texas Speed Mustang headers with catted connection pipes?
Both packages use the same 1-7/8" 304 stainless Texas Speed headers. This package adds a full 3" catted X-pipe, while the connection pipe package (TSP-50178H-CON-CAT) pairs the headers with catted connection pipes instead of an X-pipe.
Are these Mustang GT headers street legal?
No. Texas Speed sells this header and catted X-pipe system for off-road and competition use only. It is not emissions compliant and is not CARB exempt, so it is not legal for use on pollution-controlled vehicles driven on public roads.
